Take-up mechanism



G. S. HILL.

TAKE-UP MECHANISM. APPLICATION-FILED ocT.2l. ms.

Patented Dec. 7, 1920.

UNITED STATES PATENT OFFHCE...

GEORGE S. HILL, OF STRAFEORD, NEW HAMPSHIRE, ASSIGNOR, BY MESNE' ASSIGN-MENTS, T0 UNITED SHOE MACHINERY SEY, A. CORPORATION OF NEW JERSEY.

CORPORATION, OF PA'IERSON, NEW JER- TAKE-UP MECHANISM.

Application filed October 21,

T 0 all whom it may concern Be it known that I, Gnoncn S. HILL, acitizen of the United States, residing at Strafl'ord, in the county ofStrafford and State of New Hampshire, have invented certain new anduseful Improvements in Take- Up Mechanism; and I do hereby declare thefollowing to be a full, clear, and exact description of theinvention,such as will enable others skilled in the art to which it appertains tomake and use the same.

The invention relates to buttonhole sewing machines, and moreparticularly to take-up mechanism for such machines.

The object of the invention is to provide a novel and improved rotarytake-up or thread-controlling mechanism which is well adapted for use inmachines in which the sewing mechanism is rotated in sewing about theend or ends of the buttonhole, and which will act smoothly andefficiently when operated at high speed.

To this end the invention comprises the features of construction andcombination of parts hereinafter described and referred to in theclaims.

The various features of the invention will be readily understood from aninspection of the accompanying drawings, and the following detaileddescription of the mechanism illustrated therein.

In the drawings Figure 1 is a sectional elevation showing so much of abuttonhole sewing machine as is necessary to illustrate the applicationof the present invention thereto; and Fig. 2 is a detail front elevationshowing the upper needle and take-up mechanism.

In the drawings the invention is shown as embodied in a buttonholesewing machine having the same general construction and mode ofoperation as the machine shown and described in application Serial No.104,449, filed June 19, 1916.

The machine comprises, in general, a cutter which operates to cut thebuttonhole slit after the completion of the sewing, a reciprocating andlaterally-moving work clamp, and a sewing mechanism which is rotatedduring the sewing about the eye of the buttonhole, and which comprises averticallyreciprocating and late'rallywibrating or jogging upper needle,and looping and loopspreading devices including a thread-carrying looperarranged below the work and co- Specification of Letters Patent.

Patented Dec. '7, 1920.

1916. Serial No. 126,923.

forms no part of the present invention and which need not be described.The buttonhole slit is cut at the completion of the sewing by a cutteroperated by a cam on the main cam shaft of the machine. The work iscarried by the clamps over a throat plate 10 mounted upon a turret 12,which carries the under looping and loop-spreading mechamsm.

The upper needle 14 of the sewing mecha-' nism is eccentrically mountedin a hollow needle bar 16. The mechanism for vibrating or jogging theneedle bar comprises a vertically-reciprocating and laterally-vibratingcarrier sleeve 18, within which the needle bar reciprocates. The carriersleeve is reciprocated vertically through a bellcrank lever 20, thehorizontal arm of which is connected by a ball joint with the upper endof the sleeve, and the vertical arm of which is connected by a link 22with an eccentric on the sewing shaft 24. The lower end of the sleeve ismoved laterally by a link 26, one end of which is connected with a pivot28 on a rotary head 30. When the sleeve is moved downward the linkactsto swing the lower end of the sleeve and the needle bar toward theright so that the needle bar will be positioned for the depth stitch.When the sleeve is raised the link acts to swing the sleeve toward theleft so that the needle bar will be positioned to form the slit or edgestitch. The needle bar is reciprocated by a crank 32 which is secured tothe front end of the needle shaft 34 and is connected to the needle barby a link 36. The needle shaft is geared to make two revolutions foreach revolution of the sewing shaft, and the needle carrier willtherefore be moved to the right during one reciprocation of the needleand to the left during the succeeding reciprocation, so that the needlewill vibrate or jog so as to alternately form the depth and edgestitches.

The rotary head 30, in which the carrier sleeve and needle bar arecarried, and the rotary turret 12, in which the looper mechanism iscarried, are rotated in unison during the sewing about the eye of thebuttonhole through shafts 38 geared to the head and turret, and operatedby connected gear segments 40, one of which is provided with an armcarrying a roll engaged by a cam on the main cam-shaft of the machine.

In embodying the present invention in the machine above described, arotary take-up mechanism for taking up and controlling the upper needlethread is combined with the stitch-forming mechanism, and this take-upis preferably arranged above the needle bar so that the thread may leadfrom the take-up directly to the upper end of the bar. The term rotarytake-up is used herein to define a takeup which rotates in the samedirection in taking up and giving out the thread, as distinguished fromoscillating take-ups which move in opposite directions in taking up andgiving out the thread. As shown, the take-up comprises two disks 42,which are spaced to provide a thread-guiding passage between them andare connected by a screw-stud 44 which also acts as a take-up crank pinfor engaging and operating upon the upper needle thread. The disks arealso connected by a second screw-stud 46 which is arranged substantiallyin the axis of the take-up. This central stud may be, and preferably is,arranged slightly eccentric to the axis of the take-up so that it willmodify the action of the take-up pin 44 as it begins to take up theneedle thread during the upward stroke of the needle and as it ceases toact upon the thread durin the downward stroke of the needle. The innerdisk 42 of the take-up is secured to or formed on the end of theneedle-driving crank pin 32, so that the take-up is secured to androtates with the needle shaft. The thread leads from the eye of theneedle, through a light tension device 48 mounted on the side of theneedle bar, up through the hollow needle bar, over the take-up pin 44,from which it leads under a thread uide 50 to a tension device 52,

and thence t rough suitable guides to the thread supply. 7

With the above construction and arrangement the needle thread issmoothly and uniformly taken up and controlled without complication ofthe parts and without sudden or violent strains or pulls on the thread.

While it is preferred to employ the specific construction andarrangement of parts shown and described, especially in embodying theinvention in the machine of the application above referred to, it willbe understood that this construction and arrangement is not essential tothe broader features of the invention, but may be varied or modified asfound desirable orbest suited to the construction and arrangement of theparts and mechanisms of the machine in which it is to be embodied.

Having explained the nature and object of the invention, andspecifically described one form of mechanism in which it may beembodied, what is claimed is:

1. A sewing machine, having, in combination, a work clamp, astitch-forming mechanism comprising an upper needle bar and needle and acomplementary under thread mechanism, rotary supports in which thestitch-forming mechanism is mounted, a rotary take-up acting on theupper needle thread adjacent to the needle bar, and mechanism forrelatively actuating the stitchforming mechanism and work clamp to sewabout a buttonhole.

2. A sewing machine, having, in combination, a work clamp, astitch-forming mechanism comprising a vertically-reciprocatlng hollowneedle bar and a complementary under thread mechanism, a rotary takeupabove the needle bar from which the thread leads directly into the bar,and mechanism for relatively actuating the stitchforming mechanism andthe work clamp to sew about a buttonhole.

3. A sewingmachine, having, in combination, a stitch-forming mechanismcomprising a vertically-reciprocating upper needle bar, a rotary supportfor the bar, and a rotary take-up acting on the needle thread above theneedle bar. e

4. A sewing machine, having, in combination, a stitch-forming mechanismcomprising a verticallyreciprocating hollow needle bar, and a rotarytake-up above the bar from which the thread leads directly into the bar.e

5. A sewing machine, having, in combination, a stitch-forming mechanismcomprising a vertically-reciprocating -upper needle bar, a crank forreciprocating the bar, a take-up secured to the crank above the needlebar and provided with a take-up crank stud. p

6. A sewing machine, having, in combination, a stitch-forming mechanismcomprising a vertically-reciprocating and laterally-vibrating needle barand a complementary under thread mechanism, and a rotary take-up for theneedle thread arranged above the needle bar.

7. A sewing machine, having, in combination, a stitch-forming mechanismcomprising a vertically-reciprocating needle bar, a crank forreciprocating the-bar, takeup disks secured to the crank above theneedle bar, a take-up crank pin between the disks, and a substantiallycentral pin between the disks.

I GEORGE S. HILL.

